Modify ApiClient to report better error messages for non-200 responses.
Modify ApiClient to report better error messages for non-200 responses.

Sam1301/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,nashvail/zulip-mobile,saketkumar95/zulip-mobile,nashvail/zulip-mobile,saketkumar95/zulip-mobile,Sam1301/zulip-mobile,vishwesh3/zulip-mobile,kunall17/zulip-mobile,Sam1301/zulip-mobile,saketkumar95/zulip-mobile,Sam1301/zulip-mobile,Sam1301/zulip-mobile,kunall17/zulip-mobile,kunall17/zulip-mobile,Sam1301/zulip-mobile,kunall17/zulip-mobile,saketkumar95/zulip-mobile,nashvail/zulip-mobile,vishwesh3/zulip-mobile,saketkumar95/zulip-mobile,nashvail/zulip-mobile